However, for a complete understanding of the evolution of life histories within the family Poeciliidae we need thorough descriptions of variation among multiple populations through both space and time, with a particular emphasis on species for which no life-history data are available.
MATERIALS AND METHODS--Study Species--Gambusia vittata is a viviparous fish of the family Poeciliidae.
Superfetation is the ability of a female to simultaneously carry several broods at different developmental stages (Turner, 1937), and is present in several members of the family Poeciliidae (Reznick and Miles, 1989; Pires et al.
olivaceus (Storer), blackspotted topminnow W, NE Family Poeciliidae
(live-bearing fishes) Gambusia affinis (Baird & Girard), mosquitofish W Order Atheriniformes Family Atherinidae (silversides) Labidesthes sicculus (Cope), I brook silverside Menida beryllina (Cope), inland S silverside Order Mugiliformes Family Mugilidae Mugil cephalus Linnaeus, striped S mullet Order Gasterosteiformers S (sticklebacks) Family Gasterosteidae (sticklebacks) Culaea inconstans (Kirtland), N, SE brook stickleback Gasterosteus aculeatus, NW Linnaeus, threespine stickleback Pungitius pungitius (Linnaeus), NW ninespine stickleback Order Scorpaeniformes Family Cottidae (sculpins) Cottus bairdi (Girard, mottled I sculpin C.